This document discusses stardust and its movement through space. Certain factors like supernovae and stellar winds contribute to the creation and movement of stardust. Dust-driven stellar winds push stardust into space, as gas masses are pushed outward by dust grains formed near stars. Testing methods have yielded measurements of dust grain sizes in the vicinity of stars, revealing an ideal grain radius of around 300 nm. The document concludes by discussing the role of aging stars in spreading stardust and chemical evolution throughout the cosmos.
This slideshow will be shown to the class as an introduction. Students will write down adjectives to describe the differences they notice in the pictures. They will then make a hypothesis on what is the difference between comets, meteoroids and asteroids.
This slideshow will be shown to the class as an introduction. Students will write down adjectives to describe the differences they notice in the pictures. They will then make a hypothesis on what is the difference between comets, meteoroids and asteroids.
Prezentare in limba engleza-elevii Pavel Elena, Sav Ioana, Ispas Darius-cls. XC
Prezentare multimedia realizata in cadrul Concursului Stiintific National de Astronomie- editia 2015 "Nicolaus Copernic"
Colegiul National "Horea, Closca si Crisan " Alba Iulia, Jud. Alba
Cloudgene - A MapReduce based Workflow Management SystemLukas Forer
Cloudgene is a freely available platform to improve the usability of MapReduce programs by providing a graphical user interface for the execution, the import and export of data and the reproducibility of workflows on in-house (private clouds) and rented clusters (public clouds).
Prezentare in limba engleza-elevii Pavel Elena, Sav Ioana, Ispas Darius-cls. XC
Prezentare multimedia realizata in cadrul Concursului Stiintific National de Astronomie- editia 2015 "Nicolaus Copernic"
Colegiul National "Horea, Closca si Crisan " Alba Iulia, Jud. Alba
Cloudgene - A MapReduce based Workflow Management SystemLukas Forer
Cloudgene is a freely available platform to improve the usability of MapReduce programs by providing a graphical user interface for the execution, the import and export of data and the reproducibility of workflows on in-house (private clouds) and rented clusters (public clouds).
In situ collection of dust grainsfalling from Saturn’s rings intoits atmosphereSérgio Sacani
During the Cassini space-craft’s Grand Finale mission in 2017, it per-formed 22 traversals of the 2000-km-wideregion between Saturn and its innermost Dring. During these traversals, the onboardcosmic dust analyzer (CDA) sought to collectmaterial released from the main rings. Thesciencegoalsweretomeasurethecomposition of ring material anddetermine whether it is falling in-to the planet’s atmosphere.
4. Stardust from Stellar Aging/Deaths Reveals
Connections to the Origins of Life
Makeup of stardust
Importance of stardust and movement through space
5. Certain Factors Contribute to the Creation
and Movement of Stardust
Supernovae
Stellar Winds
Contributing Variables that Drive Gas away
- Surface temperature, mass, luminosity, chemical composition, magnetic field
6. Dust Driven Stellar Winds Push Stardust into
Space
Gas masses are pushed
outward by dust
Grains are formed near
the star to trigger outflow
- Made of abundant materials
with radiative cross sections
Silicates lacking in iron are said to
increase photon scattering over
- Provide radiative
acceleration needed for winds
7. Specific Testing Methods Yield Different
Results
To test, size and composition of
dust grains measured in vicinity of host star
Polarization methods
Silicate particles 600 nm in diameter
from vicinity of cool, giant stars
9. What Does this all Mean?
The role of aging stars in the cosmic-matter cycle
The origins of stardust and the chemical evolution of the cosmos
10. References
Hofner, Susanne. "Fresh Light on Stardust." Nature 484 (2012): 172-73.
Web. 13 Nov. 2015.
Norris, Barnaby M.R., et al. "A Close Halo of Large Transparent Grains
around Extreme Red Giant Stars." Nature 484 (2012): 220-22.
Web. 13. Nov. 2015.
"We Are All Stardust." Web log post. Clastic Times. N.p., 17 Jan. 2014.
Web. 14 Nov. 2015.
